A character, path to a cache directory. The directory has to exist.
The NULL (default) uses and creates
'ilostat' directory in the temporary directory from
tempdir. The directory can also be set with
option ilostat_cache_dir,
cache_update
a logical whether to delete only out of date cache files. Useful when cache_dir
is set as keep only update datasets. Can be set also with
options(ilostat_update = TRUE). Default is FALSE.
quiet
a logical, if TRUE , don't return message from processing, FALSE (default).
Can be set also with options(ilostat_quiet = TRUE),